What Affects The Value Of A Resistor?

Andrew Hayes. 23/10/01. What Factors Affect the Value of a ohmic exemption? Introduction: Resistance is caused when the free electrons in a conducting outfit bump around with the vibrating atoms, so losing energy. When the electrons collide with the atoms the atoms vibrate more(prenominal) vigorously and the metal work overs hot. The Vari able-bodieds: The thickness of the equip:- If the telegraph is thin in that location depart be more underground than if it was wider because there go out be fewer free electrons in the fit to carry the dash so less charge lead be able to flow. The space of the wire:- If the wire is capaciouser, there go forthing be more impedance than if it was shorter because there depart be more atoms in the wire for the free electrons to bump into. The temperature of the wire:- If the wire is ho t the shield exit be greater because the atoms leave alone vibrate more vigorously and so the electrons depart collide with them more often. The worldly used:- Some materials will aim more free electrons than others and so will be able to carry more charge reservation the shield less. alike some will have more atoms than others and so the electrons will collide with them more often, making the fortress greater. My Chosen variant: I am spillage to investigate the duration of the wire. foresight: I predict that if I increase the length of the wire, the resistance will in like manner increase. I study this because if the wire is eight-day there will be more atoms in the wire for the electrons to collide with, so make greater resistance. I think the graph of my results will facial expression like this: I think this because I predict that the length of the wire will be directly proportional to the resistance of the wire. My reasoning for this is that the triumph for ohmic resista! nces in series is that you add the resistance of separately resistor to quiver the final resistance. Each 10 cm cutting of wire will have the selfsame(prenominal) resistance so the resistance will go up in equal blocks. explorative Method: Apparatus: telegram, stamp onslaught Pack, Crocodile Clips, Digital Multimeter, Wire Cutters, Meter Rule. Diagram: Method: 1: Set up apparatus as in the plat above. 2: utilise the wire cutters, cut lengths of wire 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, and 6cm long. 3: front take the shortest physical composition of wire and place it between the both terminals. 4: right away turn on the power and tax the resistance. Record this in your results table. 5: Next take the 2 cm wire and repeat move 3 and 4 with it. 6: reduplicate step 5 with the rest of the lengths of wire. 7: Repeat steps 3-6 two more mea sure as shooting.

8: repulse an come of your results. 9: Put your results into a graph. Fair runnel Points: To make sure my experiment remains a becoming test I will only change my chosen variable. I will use the same diameter wire, 0.27 mm, for each test and I will use the same material. I will also try to keep the temperature the same done out. To eliminate every anomalous results and make my results more sinless I will do the experiment three times and take an average of my results. Preliminary Results: Conclusions I Have make From my Preliminary Results: I have decided to use atomic number 28 Chrome for my experiment because copper does non transmit tolerable change in resistance. I have prime that I do not need to use a battery the great unwashed in my tour! . I have also found that collapse up in 1 cm intervals does not give enough change. Now I am going to go up in 10 cm intervals and so I do not waste lots of wire I will have just one long physical composition of wire and slide the crocodile clips up and down it. The next is my updated circuit: Also I will find the resistance of 0 cm of wire and take this value past from my results averages to get rid of the resistance in the wires connecting the multimeter. If you want to get a full essay, order it on our website: BestEssayCheap.com

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